Is it worth buying an older second hand car with CVT?

Disclaimer I know literally nothing about cars - hence the post here! I'm looking at purchasing my first car, just a standard runabout with enough engine to handle long distance driving but that isn't gonna break the bank with fuel costs. I've got a pretty tight budget so I can't afford to be too picky. I just test drove a 2007 Nissan Tiida which seems like a decent fit for my needs, but it has CVT transmission, which is something I've heard people warning against, especially for older Nissan models. Is it something I should be concerned about? Should I go ahead and buy it or look at other options? Thanks in advance!